Air circulation fan

ABSTRACT

An air circulation fan includes a rod fixed to the ceiling and a motor is connected to the lower end of the rod. A base is connected to the motor and a cover is connected to the underside of the base. Multiple blades are connected between the base and the cover. A space is defined between the between the base and the cover. The fan has multiple outlets defined between the blades and communicating with the space. An inlet is defined through the underside of the fan and communicates with the space. Multiple filtering members are connected between the base and the cover and located on the periphery of the fan to cover up the outlet. Air is sucked from the inlet and circulates by the rotation of the blades, and passes through the filtering members and flows out from the outlets.

BACKGROUND OF THE INVENTION

(1) Fields of the Invention

The present invention relates to a fan, and more particularly, to an aircirculation fan to quickly circulate air in a room, and the air isfiltered by the filtering members of the fan.

(2) Descriptions of Related Art

Generally, when using an air conditioner to cool down the airtemperature in a room, it takes about 15 to 20 minutes for the operationof the compressor of the air conditioner to let the air temperature todrop to the desired value. However, this action consumes a lot ofelectric energy, so that people uses a ceiling fan to accelerate the aircirculation to reduce the time required.

The conventional ceiling fan generally comprises a motor which drivesthe fans to blow the air in the upper portion of the room downward.However, the hot air usually is located in the upper portion of the roomso that the conventional ceiling fan blows the hot air downward, whilethe cold air is still located in the lower portion of the room, so thatthe air circulation is not efficient. The purpose of reducing the airtemperature in the room mentioned above cannot achieve quickly, and theelectric energy cannot be saved as expected. Besides, the downwardblowing of the air can blow the dust on the floor and which is not goodfor the people in the room.

The present invention intends to provide an improved ceiling fan thatimproves the shortcomings mentioned above.

SUMMARY OF THE INVENTION

The present invention relates to an air circulation fan and comprises arod having a fixing portion fixed to a ceiling. A motor is connected tothe lower end of the rod. A fan has a base, an annular cover andmultiple upright blades. The base is connected to the motor and drivenby the motor. The cover is horizontally connected to the underside ofthe base so as to form a space between the base and the cover. Theblades are connected between the base and the cover. The blades arearranged along the periphery of the fan. Multiple outlets are definedbetween the blades and communicate with the space. An inlet is definedthrough the underside of the fan and communicates with the space.Multiple filtering members are connected between the base and the coverand located on the periphery of the fan to cover up the outlets. Air issucked from the inlet and circulates by the rotation of the blades, andpasses through the filtering members and flows out from the outlets.

The primary object of the present invention is to provide an aircirculation fan wherein the rotation of the blades of the fan sucks airfrom the inlet and generates spiral air flows which flow out from theoutlets via the filtering members. The cool air in the lower portion ofthe room is sucked upward and circulates with the hot air in the upperportion of the room so that the temperature of the room can be quicklyreduced by the mixture of the hot and cool air. The filtering membersfilter the air to increase the quality of the air in the room.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the air circulation fan of the presentinvention;

FIG. 2 is another exploded view of the air circulation fan of thepresent invention;

FIG. 3 shows that the filtering members are to be connected to the aircirculation fan of the present invention;

FIG. 4 is another angle to show that the filtering members are to beconnected to the air circulation fan of the present invention;

FIG. 5 is a perspective view, viewed from the underside of the aircirculation fan of the present invention, and

FIG. 6 is a cross sectional view to show the air flows through the aircirculation fan of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 to 6, the air circulation fan of the presentinvention comprises a rod 10, a motor 20, a fan 30 and multiplefiltering members 40.

The rod 10 has a fixing portion 11 on the top end thereof and the fixingportion 11 is fixed to a RC truss 50 or a solid board, and the lower endof the rod 10 extends through a ceiling 51 and reaches into the room.

The motor 20 is connected to the lower end of the rod 10 and wires (notshown) from the motor 20 are connected to the power source and switch soas to control the operation of the motor 20.

The fan 30 comprises a base 31, an annular cover 32, multiple uprightblades 33, multiple shafts 34 and a cap 35. The base 31 is connected tothe motor 20 by multiple bolts 310 so that the base 31 is driven by themotor 20 to rotate in one direction. The base 31 has a protrusion 311extending downward from the central portion thereof. The protrusion 311has a curved outer surface and the diameter of the protrusion 311 isgradually reduced along the curvature of the curved outer surface of theprotrusion 311. The cap 35 is connected to the underside of theprotrusion 311. The base 31 has a recess 312 defined in the top thereofand the motor 20 is accommodated in the recess 312. The base 31 hasmultiple blade slots 313 defined in the underside thereof and the bladeslots 313 are located around the protrusion 311. The base 31 hasmultiple engaging holes 314 defined in the underside thereof and theengaging holes 314 are located close to a periphery of the base 31. Thecover 32 is horizontally connected to the underside of the base 31 so asto form a space 36 between the base 31 and the cover 32. The blades 33are connected between the base 31 and the cover 32. The blades 33 arearranged along the periphery of the fan 30. Multiple outlets 37 aredefined between the blades 33 and communicate with the space 36. Aninlet 38 is defined through the underside of the fan 30 and communicateswith the space 36. The cover 32 has a U-shaped cross section. The cover32 has multiple restriction slots 320 defined in the top thereof, eachrestriction slot 320 is defined between two restriction blocks. Thecover 32 has multiple positioning members 321 on the top thereof. Thetop end and the bottom end of each of the blades 33 are respectivelyengaged with the blade slot 313 and the restriction slot 320corresponding thereto. The blades 33 each is posed an angle relative tothe radial direction of the base 31, so that air in the lower portion ofthe room is sucked from the inlet 38 and circulates by the rotation ofthe blades 33, and passes through the filtering members 40 and flows outfrom the outlets 37.

Each of the blades 33 has a passage 330 defined axially therethrough. Ashaft 34 extends through the passage 330 of each of the blades 33. Twoends of each of the shafts 34 are connected to the base 31 and the cover32 respectively. The top end of each of the shafts 34 is connected witha nut 340.

The multiple filtering members 40 connected between the base 31 and thecover 32 and located on the periphery of the fan 30 so as to cover upthe outlets 37. The top side of each of the filtering members 40 isengaged with one of the engaging holes 314, and the bottom side of eachof the filtering members 40 is connected with one of the positioningmembers 321.

When the fan 30 is rotated by the motor 20, the blades 33 that are posedan angle generate spiral air flows, the air in the lower portion of theroom is sucked from the inlet 38 and circulates by the rotation of theblades 33, and passes through the filtering members 40 and flows outfrom the outlets 37. By this way, the cool air and the hot air in theroom is quickly mixed to each other so as to reduce the temperature ofthe air in the room quickly. It is noted that the air passes through thefiltering members 40 increases the air quality in the room.

The air circulation fan of the present invention can quickly mix thecool and hot air to each other so as to cool down the air temperature inthe room and to let the air conditioner be functioned efficiently.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

What is claimed is:
 1. An air circulation fan comprising: a rod having afixing portion on a top end thereof and the fixing portion adapted to befixed to a ceiling; a motor connected to a lower end of the rod; a fanhaving a base, an annular cover and multiple upright blades, the baseconnected to the motor and being driven by the motor, the coverhorizontally connected to an underside of the base so as to form a spacebetween the base and the cover, the blades connected between the baseand the cover, the blades being arranged along a periphery of the fan,multiple outlets defined between the blades and communicating with thespace, an inlet defined through an underside of the fan andcommunicating with the space, and multiple filtering members connectedbetween the base and the cover and located on the periphery of the fanso as to cover up the outlets.
 2. The fan as claimed in claim 1, whereinthe base has a protrusion extending downward from a central portionthereof, the protrusion has a curved outer surface and a diameter of theprotrusion is reduced along a curvature of the curved outer surface ofthe protrusion, a cap is connected to an underside of the protrusion. 3.The fan as claimed in claim 1, wherein each of the blades has a passagedefined axially therethrough, a shaft extends through the passage ofeach of the blades, two ends of each of the shafts are connected to thebase and the cover respectively.
 4. The fan as claimed in claim 3,wherein the base has a recess defined in a top thereof and the motor isaccommodated in the recess.
 5. The fan as claimed in claim 3, whereinthe base has multiple blade slots defined in an underside thereof, thecover has multiple restriction slots defined in a top thereof, two endsof each of the blades are respectively engaged with the blade slot andthe restriction slot corresponding thereto.
 6. The fan as claimed inclaim 3, wherein the cover has a U-shaped cross section.
 7. The fan asclaimed in claim 3, wherein the base has multiple engaging holes definedin an underside thereof and the engaging holes are located close to aperiphery of the base, a top side of each of the filtering members isengaged with one of the engaging holes, the cover has multiplepositioning members on a top thereof, a bottom side of each of thefiltering members is connected with one of the positioning members. 8.The fan as claimed in claim 3, wherein the base is connected to themotor by multiple bolts.
 9. The fan as claimed in claim 3, wherein theblades each is posed an angle relative to a radial direction of thebase.